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Engelmann shone light of different colores (wavelengths) onto filaments of Spirogyra. Spirogyra is an alga made up of filaments (chains) of cells. He added motile bacteria (which could swim) and which needed oxygen and observed where they went. He found that the bacteria clustered around the blue and red colours of the spectrum, where the Spirogyra were producing the most oxygen. So he concluded that these two colours were the most important for photosynthesis. For an animation of his experiment see: http://www.phschool.com/science/biology_place/biocoach/photosynth/action.html See also: http://en.wikipedia.org/wiki/Theodor_Wilhelm_Engelmann
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In a scientific experiment a control is the part of the experiment that?
remains the same throughout the experiment
What is an experiment which only one variable is changed?
It is called a controlled experiment.
What gas is represented by bubbles in an experiment?
Which experiment?
Who discovered that electric charges are positive or negative?
Robert Millikan discovered the electron's charge using the oil drip experiment. Eugene Goldstein discovered positive particles with the anode/cathode ray tube. James Chadwick discovered the neutral particle with the beryllium and paraffin wax experiment.
What increases the validity of an experiment?
Repeated trials of said experiment.
What was Thomas Edison's first experiment?
Hatch goose eggs
What two materials did thomas Edison experiment with in order to make filaments?
bhbjgj
What two materials did thomas Edison experiment in order to make filaments?
bhbjgj
Was thomas Edison's first eperiment a success or a failure?
No Thomas Edison's first experiment of trying to hatch goose eggs was not successful. HaHaHa
When did Thomas Edison do his first experiment?
hahahaha i cant believe u looked at this question
What has the author Thomas Johansen written?
Thomas Johansen has written: 'An experiment with oral transmission' -- subject(s): Folklore, Oral tradition, Devil, Classification, Uncles '70 opgaver i katalogisering'
How did thompsons experiment change daltons atomic model?
thomas discovered that the atom contained smaller particals called electrons
What has the author Thomas H Barr written?
Thomas H. Barr has written: 'Vector calculus' -- subject(s): Vector analysis 'Naval Warfare Analysis Experiment' -- subject(s): Management 'Multivariable calculus'
What actors and actresses appeared in A Novel Experiment - 1911?
The cast of A Novel Experiment - 1911 includes: Thomas Carrigan Rex De Rosselli Winifred Greenwood Fred Herzog Adrienne Kroell Leighton Stark Otis Thayer
Who invented the electric power station?
Thomas Edison invented the first electric power plant.
Did Thomas Edison do an experiment that turned on lights with no visible wire connections?
He might have, but that sort of thing sounds more like something Nikola Tesla would be involved with.
What did Gurdon's frog experiment prove?
Gurdon's experiment proved that a cell's genetic potential do not diminish as the cell became specialized, disproving the conclusion of Robert Briggs and Thomas King following their failures to clone from differentiated cells in their 1952 landmark tadpole experiment. Gurdon's results electrified the scientific community, but some scientists remained skeptical and began to find flaws in his work.
